homo erectus is a predecessor of modern humans. Members of this species had tools made of hard wood. They stored them inside orifices. And they spent most of their time impaling things with their long rods.
They used to grunt a lot, especially while impaling things. They drew graffiti on cave walls showing them trying to mount and stick their poles in horses and other animals.
The term originated in 18th century mongolia where native tribes referred to the pandas who would go on to destroy all erectile functions of their future children and thus destroy all chances of survival.
Others claim that the phrase was coined when Arturo Lupoli used it to describe the actions of team-mate Kerry Gilbert after a fifth round Carling Cup tie in 2005.
Finally it is argued that the phrase simply refers to the act of wanking vigourously in the toilets of the Oriental Buffet in Alperton.
Mother? There is no other.